Iso-Riutta Lake
Iso-Riutta Lake in Lempäälä, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 8 m visibility. Phosphorus: 11.5 µg/L. Chlorophyll-a (algae): 6.7 µg/L.
- Clarity
- 8 m
Why Iso-Riutta Lake has no A–F grade
Iso-Riutta Lake in Finland is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Finnish Environment Institute (Syke) and the ELY Centres.
Iso-Riutta Lake is a lake in Lempäälä County, Finland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-09-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Iso-Riutta Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 26.1 ft down. Phosphorus level: 11.5 µg/L. Chlorophyll-a: 6.7 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.95 m | Not graded |
| Phosphorus | 11.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6.7 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Iso-Riutta Lake
Compare lakeside cabins, hotels, and vacation rentals near Iso-Riutta Lake in Lempäälä, Finland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Iso-Riutta Lake
Frequently asked questions about Iso-Riutta Lake
What is the water quality of Iso-Riutta Lake?
- Iso-Riutta Lake in Lempäälä, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 8 m visibility. Phosphorus: 11.5 µg/L. Chlorophyll-a (algae): 6.7 µg/L.
Is Iso-Riutta Lake safe to swim in?
- Iso-Riutta Lake has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
How deep is Iso-Riutta Lake?
- The available depth estimate for Iso-Riutta Lake is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Explore Iso-Riutta Lake across LakeGrade
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Where this data comes from
5 measurements from 1 monitoring station, 2020. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla5 samples · 2020
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
50748
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2020-09-10
Monitoring stations: 1